what mass (in grams) of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution

Answer:

chlorine atom

A chlorine atom has 17 protons, 18 neutrons, and 17 electrons.

Explanation:

Answer:

chlorine atom

Explanation:

A chlorine atom has 17 protons, 18 neutrons, and 17 electrons.

The pH of a solution with a concentration of hydronium ions of 5.29×10⁻¹⁰ is 9.28 ,therefore option (d) is correct.

pH is a measure of hydrogen ion concentration, a measure of the acidity or alkalinity of a solution.

The pH scale usually ranges from 0 to 14. Aqueous solutions with a pH less than 7 are acidic, while those with a pH greater than 7 are basic or alkaline. A pH level of 7.0  is neutral.

To calculate the pH of a solution with concentration of hydronium ions of 5.29×10⁻¹⁰-

We know that ,

pH=−log(H₃O⁺) ..............(1)

Given, H₃O⁺=5.29×10⁻¹⁰

So, we need to calculate,

= −log(5.29 .10⁻¹⁰) ............from above (1)

=  9.28

The pH of a solution with a concentration of hydronium ions of 5.29×10⁻¹⁰ is 9.28 ,hence option (d) is correct.

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Between 1766 and 1849, the number of states that joined the United States is twice the number of states that joined between 1850 and 1899.

During the period from 1766 to 1849, a total of 16 states joined the United States. This means that between 1850 and 1899, the number of states that joined would be half of that, which is 8 states. It is important to note that the actual years of statehood may vary slightly, as statehood dates can differ for various reasons. However, based on the given time periods, the number of states that joined the United States follows this pattern.

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Answer:

Explanation:Erosion is a physical change

The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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Answer:d

Explanation:

the results indicated

Answer:

No, the results indicated that the scars were reduced, not erased.

Explanation:

beacuse i got it correct

Answer:

90% of people marry there 7th grade love. since u have read this, u will be told good news tonight. if u don't pass this on nine comments your worst week starts now this isn't fake. apparently if u copy and paste this on ten comments in the next ten minutes you will have the best day of your life tomorrow. you will either get kissed or asked out in the next 53 minutes someone will say i love you

Explanation:

Answer:

linear angleee

Explanation:

lol i dont know what to put here

Answer:

B) Bent

There are a lot of types of bents but this one is linear bent.

Answer:

i dont know

Explanation:

because i dont know 45

Answer: Fluorine

Explanation:   There are many variables that can affect the strenght of attraction of the electrons in a chemical bond.

The most significant of them is the electronegativity: a meassure of the affinity an element has with the electrons . The higher the electronegativity, the stronger the attraction with electrons.

Brainliest pls Have a nice day

Answer: 25%

Explanation: bb are don't have a dominant trait to overmask it

In case of O3 or SO2, the SO2 has a greater dipole moment than O3.

In case of HBr or HCl, the HCl  has a greater dipole moment than HBr.

In contrast to SO2, which has shorter and stronger bonds than SO, O3 has longer and weaker bonds than O2.

Recoupled pair bond dyad in SO2 produces SO double bonds. On the other hand, O3 has a lone pair on the center oxygen atom in addition to a pair of orbiting electrons on the terminal oxygen atoms, which results in a comparatively weak connection.

Both molecules are polar, although SO2 is more polar than O3 (dipole moment 0.53D ) with a dipole moment of 1.62D.

EN values for Br (2.96), Cl (3.16), and H (2.2) . Cl has the greatest electronegativity; the difference in polarity between H and Cl is the largest, 0.96; while in HBr, the difference in EN value is 0.76.

As a result, HCl will have a higher dipole moment than HBr. The increment of dipole moment is directly proportional to the increment of the electronegativity.

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The reaction is included in a redox reaction

Further explanation:

Given

Reaction

2 Ca + O₂ → 2 CaO

Required

a redox reaction

Solution

Redox reactions are reactions where there is a change in oxidation number

Oxidation is an increase/increase in oxidation number, while reduction is a decrease/decrease in oxidation number.

Reducing agents are substances that experience oxidation  and oxidizing agent are substances that experience reduction

in the above reaction is included in a redox reaction because there is a change in oxidation number

Ca⇒Ca²⁺+ 2e⁻(for balanced equation : 2Ca⇒2Ca²⁺+4e⁻)

Oxidation ( 0 to +2)

O₂+2e⁻⇒O²⁻(for balanced equation : O₂+4e⁻⇒2O²⁻)

Reduction (0 to -2)

The waves which have some electrical properties, and some magnetic properties are called as electromagnetic waves. The correct answer is option d.

Electromagnetic waves are a type of wave that consists of both electric and magnetic fields oscillating perpendicular to each other and to the direction of wave propagation.

They do not require any medium to propagate and they can travel through a vacuum. These waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

Therefore, option d. electromagnetic waves have some electrical properties and some magnetic properties.

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Thomas Paine once said it is only error and not truth that shrinks from inquiry. He meant that the more you inquire about something, less error and mistakes come from it, and more truth will.

It means that you can not make a problem worse by inquiring about it but you can only lessen the error within it. Thomas Paine was likely referring to the idea that truth has nothing to fear from examination or investigation, whereas error does. In other words, if a belief or idea is true, it should be able to withstand scrutiny and examination. On the other hand, if a belief is based on error, it will crumble when subject to inquiry.

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Answer:30mL

Explanation:

If you add 2.50 with 0.750 divide that by 100 you would get 30.7 something without rounding it would be 30.

Answer:

2.38 g of oxygen (O2).

Explanation:

What is given?

Mass of potassium chlorate (KClO3) = 6.06 g.

Molar mass of KClO3 = 122.4 g/mol.

Molar mass of oxygen (O2) = 32 g/mol.

Step-by-step solution:

First, let's state the balanced chemical equation. Remember that the decomposition of a compound produces two or more products:

Now, let's convert 6.06 g of KClO3 to moles using its molar mass:

You can see in the chemical equation that 2 moles of KClO3 produce 3 moles of O2. By doing a rule of three with this data, we obtain that:

The final step is to convert from 0.0743 moles of O2 to grams using its molar mass, like this:

The answer is that we will produce 2.38 g of oxygen (O2) from the decomposition of 6.06 g of potassium chlorate (KClO3).

83.3% yield

Explanation:

First, we need to convert 240 g of \(Fe_{2}O_{3}\) into moles:

\(240 \:g \:Fe_{2}O_{3} \:\times(\frac{1\:\text{mol}\:Fe_{2}O_{3}}{159.69\: \text {g}\:Fe_{2}O_{3}})\)

\(=1.50 \:\text{mol}\:Fe_{2}O_{3}\)

Next, find the theoretical Fe yield using molar ratios.

\(1.50 \: \text {mol} \: Fe_{2}O_{3}\: \times (\frac{2\: \text{mol} \: Fe}{1 \:\text{mol} \: Fe_{2}O_{3}})\)

\( = 3.00 \: \text{mol} \: Fe\)

Then convert this back into grams:

\(3.00 \: \text{mol} \:Fe \times (\frac{55.845 \: \text{g} \: Fe}{1 \: \text{mol} \: Fe}) = 168 \: \text{g} \: Fe\)

Note that actual yield is only 140 g Fe so percentage yield is

\(\dfrac{140\:\text{g}\:Fe}{168\:\text{g}\:Fe} \times 100\)%= 83.3%

83.3%

The answer is 83.3%

Explanation:

Fractional distillation is used to separate crude oil into simpler, more useful mixtures . This method can be used because different hydrocarbons have different boiling points

Hope this help u

The catalyst for the given reaction is \(I_{2}\)

In almost every facet of the chemical industry, catalysis is an essential process. According to some estimates, catalysts are used at some point during the production of around 90 percent of all chemical products sold in commercial settings. The word "catalyst" originates from the Greek word "katal," which may be translated as "to loosen" or "to untie."

In almost every facet of the chemical industry, catalysis is an essential process. According to some estimates, catalysts are used at some point during the production of around 90 percent of all chemical products sold in commercial settings.

The slower step of the reaction is CH3CHO+I2CH3I+CO+HI.

The given reaction is as follows:

Rate = k [CH3CHO] [I2] The reaction goes through a two-step mechanism.

The two steps of the reaction are:

CH3CHO+I2→CH3I+CO+HI CH3I+HI→CH4+I2

The catalyst of the given reaction is I2. The rate of decomposition of acetaldehyde into methane and CO in the presence of I2 at 800 K follows the rate law:

Rate = k[CH3CHO][I2]

The decomposition is believed to go by a two-step mechanism, that is, CH3CHO+I2CH3I+CO+HI and CH3I+HICH4+I2.

Out of these two steps, the slower one is CH3CHO+I2CH3I+CO+HI.

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Put an arrow labeled heat and pressure, pointing from sediment to metamorphic rock.

A rock is a solid mass that could occur either on the earth surface or in the earth's crust. There are several kinds of rocks that exist. There are the igneous rocks, the sedimentary rocks and the metamorphic rocks.

The igneous rock is the first formed rock. The sedimentary rock is formed from the remains of organisms that pile up overtime. Metamorphic rocks are formed when rocks change overtime.

The correct label that completes the diagram is;

Put an arrow labeled heat and pressure, pointing from sediment to metamorphic rock.

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The sentence our eyes are made of nerve tissue, blood vessel tissue, muscle tissue, lens tissue, pupil tissue, and many more types of tissue to make eyes is supported by the interaction of these structures to form an organ.

An organ is a group of different tissues (such as in the case of  eye the muscle tissue and nerve tissue ) which work together to play one or more particular roles.

Therefore, with this data, we can see that an organ is a group of tissues that play particular roles in the body.

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The stepwise mechanism for the isomerization of 2,3-dimethylbut-1-ene to 2,3-dimethylbut-2-ene using strong acid (such as H2SO4) is as follows:

Step 1: Protonation of the double bond The first step involves the protonation of the double bond in 2,3-dimethylbut-1-ene by the strong acid, H2SO4. This creates a carbocation intermediate on the more substituted carbon atom (the one with more alkyl groups attached).

Step 2: Migration of the alkyl group In the second step, one of the alkyl groups attached to the carbocation intermediate migrates to the adjacent carbon atom (the one with the less substituted carbon atom). This step occurs via a hydride shift mechanism, where a hydrogen atom is transferred from the adjacent carbon atom to the carbocation.

Step 3: Deprotonation Finally, the last step involves deprotonation of the intermediate to form the more stable 2,3-dimethylbut-2-ene product. This is done by the conjugate base of the strong acid (in this case, HSO4-). Overall, the isomerization process involves the conversion of a less stable alkene (2,3-dimethylbut-1-ene) to a more stable alkene (2,3-dimethylbut-2-ene) via the rearrangement of the carbocation intermediate.

Protonation is the addition of a proton to an atom, molecule, or ion, producing a conjugate acid. Examples include: Protonation of water by sulfuric acid: H₂SO₄ + H₂O H₃O⁺ + HSO−4 Protonation of isobutene in the formation of carbocations: (CH₃)₂C=CH₂ + HBF₄ (CH₃)₃C⁺ + BF−4

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According to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.

Chemical reaction is defined as a procedure where one or more compounds, known as reactants, are changed into one or more new substances, known as products. When atoms establish or break chemical bonds, chemical reaction take place.

Law of conservation of mass is defined as a chemical reaction requires that the total mass of the reactants and products be equal. Law of conservation of mass also stated that mass is always conserved throughout chemical reactions and cannot be created or removed.

Thus, according to the law of conservation of mass, there is no net change in the reactants' and products' masses before and after a chemical reaction.

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P2 = 40 atm

Explanation:

Given:

P1 = 2 atm

V1 = 1200 L

V2 = 60 L

P2 = ?

Using Boyle's law and solving for P2,

P1V1 = P2V2

P2 = (V1/V2)P1

= (1200 L/60 L)(2 atm)

= 40 atm

Answer:

1. Convert the mass of A to moles dividing in molar mass

2. Convert the moles of A to moles of D (2mol A = 3mol D)

3. Convert the moles of D to mass multiplying by its molar mass

Explanation:

As you can see in the equation, 2moles of A produce 3 moles of D, the equation is:

2mol A = 3mol D

But in the problem you are having the mass of A and you need the mass of D. That means you require to convert the mass of A to moles. With the moles of A you can find the moles of D and, as last, you need to convert the moles of A to mass.

To convert mass to moles or vice versa you must use Molar Mass. That means, the answer is:

c

nitrogen gas + hydrogen gas produces ammonia

N2( g)+ H2(g)=NH3( g)

hydrogen valency= 1, nitrogen =3 .Exchange them= NH3

balance

put 2 in front of NH3 to make nitrogen 2 .Them hydrogen is now 6,add3 to hydrogen to make them balance.

N2+3H2=2NH3

Answer:

The relative atomic mass of chlorine depends on the ratio between the abundance of these two naturally-occurring isotopes.

Explanation:

The relative atomic mass of an element is a weighted average of the atomic mass of its naturally-occurring isotopes. The relative abundance of each isotope gives its weight in this weighted average.

For these two naturally-occurring isotopes of chlorine:

\(\begin{array}{|c|c|c|}\cline{1-3} \text{Isotope} & \text{Atomic Mass} & \text{Relative Abundance}\\ \cline{1-3} ^{35}{\rm Cl} & \approx 34.968\; \rm Da} & \approx 0.758 \\ \cline{1-3} ^{37}{\rm Cl} & \approx 36.966\; \rm Da & \approx 0.242 \\ \cline{1-3}\end{array}\).

\(\begin{aligned}&\text{relative atomic mass of Cl} \\ &= \text{atomic mass of $^{35}{\rm Cl}$} \times \text{relative abundance of $^{35}{\rm Cl}$} \\&\quad + \text{atomic mass of $^{37}{\rm Cl}$} \times \text{relative abundance of $^{37}{\rm Cl}$} \\ &\approx 34.968\; \rm Da \times 0.758 + 36.966\; \rm Da \times 0.242 \\ &\approx 35.45\; \rm Da \end{aligned}\).

The relative abundance of \(^{35}{\rm Cl}\) is much higher than that of \(^{37}{\rm Cl}\). Consequently, the relative atomic mass of the element \(\rm Cl\) is closer to the atomic mass of \(^{35}{\rm Cl}\!\) than that of \(^{37}{\rm Cl}\!\).

HNO3+Ca(OH)2= Ca(NO3)2+H2O.Answer:

Explanation:hope this helps <3